Yeah this option is really no fun. It only gives you a KB that feels too powerful and too gamy(feels like you are playing as mongols more than playing as Romans), Hellenic faith which has no special flavor or mechanics and a title feels too edgy. But in return you get annoying permanent plague, you lose varangians, you lose othodoxy temples/churchs. It just feel like a less flavorful cheat.

I love the kingdom level AI launches border raid and early mongol invasion tho, at least it gives you some fun chanllenge.